OXYGEN NONSTOICHIOMETRY IN THE (TL, PB)-SR-CA-CU-O 1212 SYSTEM

Authors
OGBORNE DM WELLER MT
Citation
Dm. Ogborne et Mt. Weller, OXYGEN NONSTOICHIOMETRY IN THE (TL, PB)-SR-CA-CU-O 1212 SYSTEM, Physica. C, Superconductivity, 220(3-4), 1994, pp. 389-395
Citations number
20
Categorie Soggetti
Physics, Applied
Journal title
Physica. C, Superconductivity → ACNP
ISSN journal
09214534
Volume
220
Issue
3-4
Year of publication
1994
Pages
389 - 395
Database
ISI
SICI code
0921-4534(1994)220:3-4<389:ONIT(P>2.0.ZU;2-O
Abstract
Materials in the (Tl, Pb)Sr2CaCu2O7-delta system have been synthesised with different oxygen stoichiometries and their structure and superco nducting properties studied. Powder neutron-diffraction studies reveal that for delta > 0 vacancies exist in the thallium-oxygen layer leadi ng to an increase in the c lattice parameter, apical copper-oxygen bon d and the inter-cuprate layer distance. These structural changes are d iscussed in relation to the superconducting properties and comparisons drawn to the double-thallium layer materials.